<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="container">
       <div class="input-group input-group-lg">
            <span class="input-group-addon">@</span>
            <input type="text" class="form-control" placeholder="username">
            <span class="input-group-addon">.00</span>
        </div>
        <div class="input-group">
            <span class="input-group-addon">@</span>
            <input type="text" class="form-control" placeholder="username">
            <span class="input-group-addon">.00</span>
        </div>
        <div class="input-group input-group-sm">
            <span class="input-group-addon">@</span>
            <input type="text" class="form-control" placeholder="username">
            <span class="input-group-addon">.00</span>
        </div>
        <div class="col-lg-6">
            <div class="input-group">
                <span class="input-group-addon">
                    <input type="checkbox" aria-label="...">
                </span>
                <input type="text" class="form-control">
            </div>
            <div class="col-lg-6">
                <div class="input-group">
                    <span class="input-group-addon">
                        <input type="radio">
                    </span>
                    <input type="text" class="form-control">
                </div>
            </div>
        </div>

        <div class="row">
            <div class="col-lg-6">
                <div class="input-group">
                    <span class="input-group-btn">
                        <button class="btn btn-default" type="button">搜索</button>
                    </span>
                    <input type="text" class="form-control" placeholder="请输入要求填写的内容">
                </div>
            </div>
            <div class="col-lg-6">
                <div class="input-group">
                    <input type="text" class="form-control" placeholder="请输入要求填写的内容">
                    <span class="input-group-btn">
                        <button class="btn btn-default" type="button">搜索</button>
                    </span>
                </div>
            </div>

            <div class="input-group">
                <div class="input-group-btn">
                    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
                        Action
                        <span class="caret"></span>
                    </button>
                   <!-- <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
                        <span class="caret"></span>
                    </button>-->
                    <ul class="dropdown-menu" role="menu">
                        <li><a href="#">一</a></li>
                        <li><a href="#">二</a></li>
                        <li><a href="#">三</a></li>
                        <li><a href="#">四</a></li>
                    </ul>
                </div>
                <input type="text" class="form-control">
            </div>
        </div>
    </div>
</body>
</html>